AAT3239
500mA MicroPower™ LDO
3239.2006.03.1.2 1
General Description
The AAT3239 MicroPower low dropout (LDO) linear
regulator is ideally suited for portable applications
where very fast transient response, extended battery
life, and small size are critical. The AAT3239 has
been specifically designed for high-speed turn-on
and turn-off performance, fast transient response,
good power supply rejection ratio (PSRR), and is
reasonably low noise, making it ideal for powering
sensitive circuits with fast switching requirements.
Other features include low quiescent current, typical-
ly 70µA, and low dropout voltage which is typically
less than 400mV at 300mA. The device is output
short-circuit protected and has a thermal shutdown
circuit for additional protection under extreme operat-
ing conditions.
The AAT3239 also features a low-power shutdown
mode for extended battery life. A reference bypass
pin has been provided to improve PSRR perform-
ance and output noise by connecting a small exter-
nal capacitor from the AAT3239's reference output to
ground.
The AAT3239 is available in a Pb-free, 8-pin
TSOPJW package in factory-programmed voltages.
Features
• 500mA Output Current
• Low Dropout: 400mV at 300mA
• High Accuracy: ±2.0%
• 70µA Quiescent Current
• Fast Line and Load Transient Response
• High-Speed Device Turn-On and Shutdown
• High Power Supply Rejection Ratio
• Low Self Noise
• Short-Circuit Protection
• Over-Temperature Protection
• Uses Low Equivalent Series Resistance
(ESR) Ceramic Capacitors
• Noise Reduction Bypass Capacitor
• Shutdown Mode for Longer Battery Life
• Low Temperature Coefficient
• TSOPJW 8-Pin Package
Applications
• Cellular Phones
• Digital Cameras
• Notebook Computers
• Personal Portable Electronics
• Portable Communication Devices
Typical Application
AAT3239
EN
IN
OUT
BYP
GND
ON/OFF
1µF 10nF 2.2µF
VIN
GND GND
VOUT
PowerLinear
™